Introduction to Tongtian Cave: Tongtian Cave is also called Zhanggu. Because there is a rock at the entrance of the cave that resembles "White Ape", it is also called "White Ape Cave". The cave runs north-south, is as narrow as an alley, and is as steep as a ladder. It is more than 600 meters long and can reach the top of the "Jiuli Chaotian" peak more than 800 meters above sea level.